@alamel
You may be missing the point that if you use GarminExpress to dl maps there is no option to deal with those maps as you describe using MapSource, simply because it won't install the files to your PC which MS uses. I still use MS in preference to using BaseCamp/MapInstall but MS is no longer supported in any case. GE is the 'thin edge of the wedge' to me. I reckon we'll maybe lose both MapSource and MapUpdater in due course, but i hope not!